Read or download the complete book: Relax, Smile, and Enjoy the View — Natural Relief for Eyestrain from Computer Use and Other Activities, self-published, 1997. Copyright 1997 Monica Pawlan. All Rights Reserved.
Most of the book is also available in the postings on this blog.
See also my posting on a vision game that can help improve vision: ULTIMEYES: A Game to Improve Vision.